mentally retarded mentally ill • mentary · · · Info · Definitions · Synonyms · Characters · · mentally retarded · · Text Common · · Latin · · Scripts 17 · · Length 6 · · Syllables Definitions · · · (noun) people collectively who are mentally retarded. Synonyms: mentally retarded, retarded, developmentally challenged. Example: "He started a school for the retarded." · · Noun Definition 1 Synonyms · · · retarded · · Synonym 1 developmentally challenged · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079